A new rare-earth vanadate LaBa_2V_3O_(11)is synthesized by the conventional solid state reaction.The single phase can be obtained at sintering temperature of 1010°C.The X-ray powder diffraction shows that the new...A new rare-earth vanadate LaBa_2V_3O_(11)is synthesized by the conventional solid state reaction.The single phase can be obtained at sintering temperature of 1010°C.The X-ray powder diffraction shows that the new compound has tetragonal structure with cell parameters a of 7.94 and c of 24.27 .The LaBaaV_3O_(11)can be decomposed to LaVO_4. Ba3(VO_2)_2 and V_2O_5 by higher sitering temperature than 1010°C.The as-sintered sample is insulator with resistivity of 10 12 ohm cm.Furthermore,if the as-sintered sample was annealed under H_2 atmosphere,the LaBa_2V_3O_(11)decomposed to LaVO_3 and BaYO_4 despite of the lower annealing temperature of 950°C.展开更多
通过对聚丙烯酰胺装置生产过程自动控制仪表现状的研究,提出了采用CENTUM VP集散控制系统作为聚丙烯酰胺装置控制的核心设备。分析Y O K O G A W A公司C E N T U M V P系统的特点和设计思想,针对聚丙烯酰胺装置简单和复杂回路的控制方案...通过对聚丙烯酰胺装置生产过程自动控制仪表现状的研究,提出了采用CENTUM VP集散控制系统作为聚丙烯酰胺装置控制的核心设备。分析Y O K O G A W A公司C E N T U M V P系统的特点和设计思想,针对聚丙烯酰胺装置简单和复杂回路的控制方案,系统阐述了软件组态设计方案及硬件设备现场联调实施。确保装置的"安、稳、长、满、优"运行,帮助企业提高生产效率,增加经济收益。展开更多
文摘A new rare-earth vanadate LaBa_2V_3O_(11)is synthesized by the conventional solid state reaction.The single phase can be obtained at sintering temperature of 1010°C.The X-ray powder diffraction shows that the new compound has tetragonal structure with cell parameters a of 7.94 and c of 24.27 .The LaBaaV_3O_(11)can be decomposed to LaVO_4. Ba3(VO_2)_2 and V_2O_5 by higher sitering temperature than 1010°C.The as-sintered sample is insulator with resistivity of 10 12 ohm cm.Furthermore,if the as-sintered sample was annealed under H_2 atmosphere,the LaBa_2V_3O_(11)decomposed to LaVO_3 and BaYO_4 despite of the lower annealing temperature of 950°C.
文摘通过对聚丙烯酰胺装置生产过程自动控制仪表现状的研究,提出了采用CENTUM VP集散控制系统作为聚丙烯酰胺装置控制的核心设备。分析Y O K O G A W A公司C E N T U M V P系统的特点和设计思想,针对聚丙烯酰胺装置简单和复杂回路的控制方案,系统阐述了软件组态设计方案及硬件设备现场联调实施。确保装置的"安、稳、长、满、优"运行,帮助企业提高生产效率,增加经济收益。
